Gobioclinus guppyi
A rare 8cm find on Curacao and Cayman Brac reefs, this small blenny hides in crevices in 26.5-28.2C water year-round.
Tops out around 8 cm, with a mottled brown and cream body that breaks up its outline against rock and coral rubble. Look for the blunt head, raised cirri (small fleshy tufts) above the eyes, and the way it perches motionless on a ledge rather than swimming in open water. Its camouflage pattern shifts slightly with the background, which is exactly why divers walk past it without noticing.
Expect it wedged into a crevice or resting on a patch of rubble or dead coral rather than out swimming the reef face. It stays still for long stretches, relying on its blotchy pattern to blend in, and will usually hold position even as divers pass close by. Most logs come from slow, close-focus looks at the reef structure rather than open-water sightings.
Its patchy, disruptive colouring is a real camouflage strategy rather than decoration, letting it sit exposed on rubble or rock without standing out to predators or prey.
No clear season shows up in the sighting data, and with water sitting comfortably between 26.5 and 28.2C, it is a year-round resident on these reefs rather than a seasonal visitor.
Reef neighbours a diver could mistake it for. Use the identification notes above to tell them apart.
Curacao is the strongest bet, with sightings spread across Willemstad and the South Coast, and Cayman Brac in the Cayman Islands runs a close second. A handful of records also come from Les Anses-d'Arlet in Martinique, so the species turns up across the wider Caribbean but never in numbers.
Mapping where Mimic Blenny is logged…
Curacao is the most reliable spot, with sightings across Willemstad and the South Coast, followed by Cayman Brac in the Cayman Islands. It has also been logged at Les Anses-d'Arlet in Martinique, so keep an eye on reef rubble anywhere in the Caribbean.
There is no detected season for this fish. It lives in warm water year-round (roughly 26.5 to 28.2C) so any month on these Caribbean reefs gives you a shot, though sightings stay rare overall.
Look for a small, 8 cm fish with a mottled brown and cream body tucked into a crevice or sitting still on rubble. The blunt head and small cirri above the eyes help separate it from smoother-headed reef fish nearby.
They stay small, reaching about 8 cm at most, which is part of why they are so easy to overlook on a reef.
No. They are harmless, small reef fish that pose no risk to divers and will simply hold still or duck deeper into a crevice if approached.
Site and sighting data is aggregated from diver logs, iNaturalist and GBIF. For taxonomy and conservation status:
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